Using svyset each time data is opened?

I am using Stata to analyze a BRFSS dataset. I am a bit confused about svy set. I ran the command when I initially downloaded and cleaned my data. My (dumb) question is: am I supposed to re run that command everytime I run my do-file? I want to get some descriptive stats, so would I have to run that command first before I can do that? TIA.